4.3.2 Fails to Load
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Crashing on Start

I've tried deleting the Quake3-UrT app and unzipping it from the .zip file but the game fails to load. I'll get a black screen then kicks me back to the desktop. No error message or anything. Here is the changelog:

OSX El Capitan version 10.11.6

Spoiler

Urban Terror 4.3 changelog

4.3.2 [04.02.2017]

- Engine: Build optimizations, full SSE/SSE2 support on Windows
- Engine: Locked sv_fps / snaps back to 20 #348
- Engine: New mouse acceleration style 2 (cl_mouseAccelStyle 2), with logistic curve for smooth and limited accel #54
- Engine: Various fixes for OpenBSD and 64bit systems #59 #60
- Engine: Updated Q_CleanStr to discard multiple color code prefixes and fixed broken COM_GetExtension #63 #38
- Engine: Fixed 'stopserverdemo' being called on clients where the command doesn't exist #63
- Scoreboard columns sorting update: KAD columns now reads KDA (kills, deaths, assists)
- Added assists to player sorting (K>D>A) on scoreboard
- Renamed '.44 Magnum' to 'Magnum' in the kill events
- Fixed scores not updating in time when moving to intermission #142
- Fixed $gametime and $roundtime calculation #346
- Instagib: Prevent bots from switching to knife
- Instagib: Display a gamemode explanation text + an 'INSTAGIB' box in the team selection menu
- Instagib: Disabled the gear selection menu in InstaGib
- Instagib: Everyone has a medkit as their sole item
- Instagib: Added a gamemode identifier, ' - INSTAGIB' next to the game mode name on the map load screen
- Gun Game: Added a cvar g_randomorder (0/1): random gun order on map load
- Gun Game: Fixed scoreboard sorting inconsistencies #319
- Gun Game: Fixed a possible server crash when two players would win at the exact same time (very unlikely)
- New sound for the Glock when a silencer is equipped
- Minor weapon specs enhancements
- Fixed 'bot_minplayers' not working properly
- New version for Paris fixing #335 and #361 along with other enhancements
- Added support for r_noborder in the menu files
- Fixed weapon verification of items when primary is 'none' #320
- New .arena scripts for maps to include the newer gametypes in the server creation menu
- Updated default.cfg, server_example.cfg and mapcycle_example.txt
- The rcon command 'players' now displays correctly auth logins and and assists were added

Uhm. Did you even read the "log" you posted?
Because, you have just posted the changelog, e.g. the patchnotes, e.g. the update details, .... :)

To get a proper log of what happens, run the game with the argument +logfile 1 and then post the content of qconsole.log here. Also post it in a [spoiler] and [code] tag please, so it doesnt clutter up the entire page. (i will edit your above post)

Another thing you can try is creating a backup of your q3config.cfg, delete it and see if that helps.